Gel holder



FIG. 1 is a front perspective view showing my new design for a gel holder;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side elevational view thereof; and,

FIG. 8 is the gel holder in a folded position and attached to an electronic flash unit. The broken line portions are shown to illustrate environment only and form no part of the claimed design. 

The ornamental design for a gel holder, as shown and described. 